Developing crop descriptor lists - Bioversity International
Developing crop descriptor lists - Bioversity International
Developing crop descriptor lists - Bioversity International
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22 BIOVERSITY INTERNATIONAL TECHNICAL BULLETIN SERIES NO. 13<br />
Example #17<br />
Type of material received<br />
1 Seed<br />
2 Seedling<br />
3 Fruit<br />
4 Shoot<br />
5 Pollen<br />
For some qualitative <strong>descriptor</strong>s, such as colour <strong>descriptor</strong>s, it is<br />
important to know whether:<br />
• a finite number of states exist;<br />
• all states need to be separately recorded; or<br />
• all states can be ranked in a meaningful way that will merge a<br />
group of states under one name.<br />
In other cases, the range of expression is at least partly continuous,<br />
but varies in more than one dimension:<br />
Example #18<br />
Leaf colour<br />
1 Green<br />
2 Yellow<br />
3 Brown<br />
4 Bluish green<br />
Example #19<br />
Seed coat texture<br />
1 Smooth<br />
2 Partially rough<br />
3 Radially rough<br />
4 Partially radially rough<br />
5 Reticulately rough<br />
6 Partially reticulately rough<br />
99 Other (specify in <strong>descriptor</strong> Remarks)<br />
In the examples above, where the level of detail can be open<br />
to interpretation by different users and can complicate future<br />
statistical analysis, it is recommended to carefully select the most<br />
representative states or include colour chart codes, reference<br />
standards or drawings, as in the examples below.
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